.student-select{
    position: relative;
    height: 8rem;
    width: 100%;
}
.select-student {
    height: 8rem;
    line-height: 8rem;
    font-size: 2.8rem;
    color: #000;
    /* margin-bottom: 2rem; */
    background: white;
    padding: 0 3rem;
    border-bottom: 1px solid #e8e8e8;
    position: fixed;
    width: 100%;
    box-sizing: border-box;
    z-index: 1;
}

.student-list {
    display: inline-block;
    float: right;
    height: 5rem;
    /* border: 2px solid #47c2c9; */
    border-radius: 5rem;
    line-height: 5rem;
    margin-top: 1.5rem;
    box-sizing: border-box;
    color: #383838;
}
.student-list-mask{
    position: fixed;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.6);
    z-index: 1;
    top: 17.2rem;
}
.student-list-ul{
    padding: 2.4rem 1.5rem 1rem 3rem;
    background: #fff;
    transform: scaleY(0);
    -webkit-transform-origin: top left;
    transition: transform .3s;
    &:after{
        content: '';
        display: block;
        height: 0;
        visibility: hidden;
        clear: both;
    }
    li{
        width: 22.86%;
        height: 7rem;
        line-height: 7rem;
        text-align: center;
        color: #383838;
        font-size: 2.4rem;
        background:#f6f6f6;
        border-radius:3px;
        float: left;
        margin-right: 2%;
        margin-bottom: 1.5rem;
    }
    .selected{
        background: #3271f1;
        color: #fff;
    }
}
.final-height {
    transform: scaleY(1);
}
.off-height {
    transform: scaleY(0);
}

.student-list span {
    padding: 0 1.4rem 0 3rem;
    position: relative;
    display: inline-block;
    min-width: 5rem;
}

.student-list img {
    margin-right: 2rem;
    width: 2rem;
    position: relative;
    top: -.2rem;
    transition: transform .3s;
    -webkit-transition: transform .3s;
}
.student-list .down{
    transform: rotate(180deg);
    -webkit-transform: rotate(180deg);
}

.student-list ul {
    position: absolute;
    width: 100%;
    left: 15%;
    top: 4.4rem;
    text-align: center;
    background: white;
    z-index: 1;
    border: 2px solid #47c2c9;
    border-top: 0;
    max-height: 30rem;
    overflow-y: scroll;
}

.student-list ul em {
    display: inline-block;
    width: 90%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    margin-left: 5%;
    height: 100%;
    border-top: 2px solid #eee;
}